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Radiology, Vol 155, 147-150, Copyright © 1985 by Radiological Society of North America

ARTICLES

Cochlear otosclerosis (otospongiosis): CT analysis with audiometric correlation

JD Swartz, DW Mandell, SE Berman, RJ Wolfson, FI Marlowe and GL Popky

Ninety patients who had suspected or confirmed fenestral or cochlear otosclerosis underwent CT examination. Foci of demineralization in the otic capsule were discovered in 20 ears (12 patients). Audiometric studies of the 12 patients revealed sensorineural hearing loss (SNHL) with distinct correlation of CT findings with progressivity and with involvement of the frequency level subtended by the specific area of the cochlea involved. Foci of abnormal increased density, presumably representing the healed phase of this disorder, were found less frequently than expected. There was a predilection for the basilar turn. All patients had static SNHL in the higher frequencies. The healed phase of this disorder is probably not consistently diagnosable with CT.


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